Zinc alloy



Patented Feb. 9, 1937 UNITED STATES ZINC Serial No. 105,422. 1935 3 Claims.

This invention relates to a zinc alloy, which is specially suitable for the production of bearings, bushes and the like and for other parts of machinery subjected to heavy friction. Alloys 5 containing high proportions of zinc and containing also aluminium, copper and small amounts of other metals are already well known as for instance the so called Z alloy and Z aluminium. Such alloys generally do not contain lead.

Well known alloys, moreover, are those containing aluminium, lead, tin and copper, whereto also small proportions of other metals may be added. In such alloys the lead content, in the case of presence of aluminium, is only about 1%.

If said alloys contain from 2 to 8% of Pb, then they are bonded by tin instead of aluminium.

This invention refers to an alloy which contains mainly zinc with aluminium, copper, normal impurities and. a high percentage of lead. The ranges of proportion of the components are generally defined by from 9 to 16% of aluminium, from 3 to 30% of lead, from 0.5 to 3% of copper, the remaining being zinc.

These new alloys are considerably different from the alloys of zinc with lead. They may be PATENT OFFICE ALLOY In Italy November 12,

employed advantageously in the place of lead bronzes and antifriction alloys, as lead with aluminium and zinc forms a soft mass containing harder pieces, this being due to the formation of alpha crystals with aggregations of eutectic.

An alloy of: 76% Zn, 12% Al, 10% Pb, 1.5% Cu is specially suitable.

Such an alloy corresponds in its behaviour to an alloy of copper with tin and lead or to an alloy of copper and lead alone, as existing for friction pieces. Besides, an alloy of 14% Al, 25% Pb, 2% Cu, 59% Zn has proved to be very advantageous.

What I claim is:

1. Zinc alloy having special resistance to fric- 15 tion characterized by a content of from 9 to 16% aluminium, from 3 to lead, from 0.5 to 3% copper, the remaining being zinc.

2. Alloy as under 1, characterized by a content of 12.5% aluminium, 10% lead, 1.5% copper and 2 76% zinc.

3. Zinc alloy as under 1, characterized by a content of 14% aluminium, 25% lead, 2% copper and 59% zinc.

ALDO DAcoo. 

